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Date: Thu, 18 Sep 2008 17:00:59 -0700 From: Jeremy Fitzhardinge <jeremy@...p.org> To: Avi Kivity <avi@...hat.com> CC: Nick Piggin <nickpiggin@...oo.com.au>, Hugh Dickens <hugh@...itas.com>, Linux Memory Management List <linux-mm@...ck.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Avi Kivity <avi@...ranet.com>, Andrew Morton <akpm@...ux-foundation.org>, Rik van Riel <riel@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com> Subject: Re: Populating multiple ptes at fault time Avi Kivity wrote: >> Yes. At worst Linux would underestimate the process RSS a bit >> (depending on how many unsynchronized ptes you leave lying around). I >> > > Not the RSS (that's pte.present pages) but the working set (aka active > list). Yep. >> bet there's an appropriate pvop hook you could use to force >> synchronization just before the kernel actually inspects the bits >> (leaving lazy mode sounds good). >> > > It would have to be a new lazy mode, not the existing one, I think. The only direct use of pte_young() is in zap_pte_range, within a mmu_lazy region. So syncing the A bit state on entering lazy mmu mode would work fine there. The call via page_referenced_one() doesn't seem to have a very convenient hook though. Perhaps putting something in page_check_address() would do the job. J -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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